19900450 has 48 divisors (see below), whose sum is σ = 39354624. Its totient is φ = 7473600.

The previous prime is 19900417. The next prime is 19900459. The reversal of 19900450 is 5400991.

It is not an unprimeable number, because it can be changed into a prime (19900459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57177 + ... + 57523.

It is an arithmetic number, because the mean of its divisors is an integer number (819888).

Almost surely, 2^19900450 is an apocalyptic number.

19900450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19900450 is a deficient number, since it is larger than the sum of its proper divisors (19454174).

19900450 is a wasteful number, since it uses less digits than its factorization.

19900450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427 (or 422 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 19900450 is about 4460.9920421359. The cubic root of 19900450 is about 270.9906452293.

The spelling of 19900450 in words is "nineteen million, nine hundred thousand, four hundred fifty".